Robert Fripp and Adrian Belew qualify as pioneers of modern guitar.
With the Discipline-era King Crimson now three decades old it is time to ask: what current guitar-based band do you think pushes the sonic envelope like this?

Here is a beautifully shot and recorded video of a post Bruford/Levin version of Crimson. (Trey Gunn – Warr guitar, Pat Mastelotto – drums, percussion)